For me, it is the compression of the suit that I am trying to alleviate, not the heat. In other words, I unzip because I can breathe better.

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While I'm not exactly sure, 1. surface texture almost certainly plays a role otherwise any fabric would do (and some are good/bad); and 3. Specialized showed years ago that leg hair has a pretty big impact (IIRC 15W?), but not so much for arms/face. As for 2. I've not seen any data showing body sculpting suits' effects, but I'd tend to think they can't do that much without causing pain.

My suit certainly feels cooler to me. But under intense effort it is quite constricting and it's sometimes more comfortable to unzip a bit. Does everybody unzip on the run? Or do just a few notable front runners? IDK, asking.
-J

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Life is tough. But it's tougher when you're stupid. -John Wayne

#3 is the big one.

Look at your forearm and how much wider it is when you take the hair into account. Sure air might flow through the hair, but it's tripping turbulent in the process. The main advantage of fabric is covering the hair.

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